I did a lab on Elements and Compounds and I would be grateful if u could provide and tell me some information on my work.
Lab --Investigation--Elements and compounds.
Can an element be separated from a compound? Can an element form a compound? In this investigation, you will attempt to prove that an element(hydrogen) can be separated from a compound (hydrochloric acid), and that element will form another compound (water). To verify what is happening in your investigation, you will perform tests. The presence of hydrogen gas can be tested by placing a small sample into an inverted test tube and bringing a burning wood splint up to the mouth of the tube. Hydrogen gas will ignite and a popping noise will be heard. the presence of water can be tested by using cobalt(II)chloride test paper. when in contact with water, the blue test strips will turn purple.
Materials:
Safety goggles, 2 test-tubes, test tube stand, dilute hydrochloric acid in dropper bottle, laboratory scoop, zinc granules, wood splint, matches, cobalt chloride test strips.
Procedure:
1. read through the procedure and make a table to record ur observations.
2. Put on ur safety goggles, and then place the test tubes in the stand.
3. Carefully fill the bottom of one test tube with 2cm of dilute hydrochloric acid.
4. Pour one small scoop of zinc granules into the test tube. Quickly invert the second test tube over the top of the first.
5. Record ur observations of the reaction. What evidence of a chemical change was there?
6. After about 30 s, remove the top test tube and cover the end with ur thumb (Keeping it upside down)
7. Ignite the wood splint and holding the gas filled test tube down at a slight angle, remove ur thumb and carefully slide the burning splint into the mouth of the test tube. Hold on tight, so as not to drop the tube.
8. Record ur observations of the reaction. what evidence shows the presence of an element?
9. If a liquid forms inside the tube, test it with the cobalt (II) chloride test strips. record the results of this test.
10. Clean up ur workstation and dispose of the materials as directed by ur teacher.
My observations:
-Bubbles form
-Zinc reacts and the acid turns smoky white
-Gases at bottom of tube rising.
-As the gas was lit, it made noises.
-Flame burns hydrogen
(Any other things I need to add?)I wasn't really sure of how to explain what I was exactly seeing, so this is what I mainly got.
My answer to the following question:
Question: Can an element be separated to form a compound? Can an element form a compound?
Answer: Yes, and element can be separated to form a compound because hydrogen was separated from the hydrochloric acid. An element can also form a compound because hydrogen was combined with Oxygen to form water.
I will post my Analysis questions on a different page, cause I think I've got too much on here already. Please read through this and tell me if whatever I have so far is correct. Other information would be greatly appreciated.
It looks ok to me.
Based on your lab procedure and observations, it seems you have conducted an experiment to investigate whether an element (hydrogen) can be separated from a compound (hydrochloric acid) and whether that element can form another compound (water).
Your observations indicate the following:
1. Bubbles form: This suggests a chemical reaction is taking place, which supports the hypothesis that hydrogen is being separated from the compound.
2. Zinc reacts and the acid turns smoky white: This indicates a reaction between the zinc granules and the hydrochloric acid, further supporting the separation of hydrogen.
3. Gases at the bottom of the tube rising: This is likely the hydrogen gas being produced during the reaction.
4. Noise when the gas was lit: This is a common reaction for hydrogen gas, which ignites and produces a popping sound.
5. Flame burns hydrogen: This confirms the presence of hydrogen gas.
To further verify your observations, you could have used cobalt(II) chloride test strips to test for the presence of water. The test strips should turn purple when in contact with water.
Regarding your answer to the question, "Can an element be separated to form a compound? Can an element form a compound?", your answer is correct. An element can be separated to form a compound, as hydrogen is separated from hydrochloric acid. Also, an element can form a compound, as hydrogen combines with oxygen to form water.
Overall, your observations and the conclusions drawn from them are appropriate for this specific experiment. It would be helpful to add details such as the quantities used (e.g., concentration of hydrochloric acid, amount of zinc granules) and specific timings to provide more accurate and detailed information about the experiment.